KROHNE MFC 300 EN - Manual (Page 62)

4
ELECTRICAL CONNECTIONS
62
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
4.10.5 Ex i inputs/outputs
Current output active (only current output terminals C/C- have HART ® capability), Ex i
I/Os
• Observe connection polarity.
• U
int, nom
= 20 VDC
• I ≤ 22 mA
• R
L
≤ 450 Ω
• X designates the connection terminals A or C, depending on the version of the signal
converter.
Current output passive (only current output terminals C/C- have HART ® capability),
Ex i I/Os
• Any connection polarity.
• U
ext
≤ 32 VDC
• I ≤ 22 mA
• U
0
≥ 4 V
• R
L, min
= (U
ext
- U
0
) / I
max
• X designates the connection terminals A or C, depending on the version of the signal
converter.
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
INFORMATION!
For further information on electrical connection refer to Description of the inputs and outputs on
page 42.
Figure 4-28: Current output active I
a
Exi
Figure 4-29: Current output passive I
p
Exi
.book Page 62 Monday, February 6, 2012 11:01 AM